CALGARY - TransCanada Corp. has lined up shipper support for its Keystone XL project thanks to a commitment from the Alberta government but the future of the controversial pipeline remains uncertain. The company said Thursday it had secured 500,000 barrels a day of 20-year commitments for the project after concluding an open season, locking up about 60 per cent of the 830,000 barrels of planned capacity. TransCanada said the numbers showed strong ...